cppcoro/include/cppcoro/sequence_traits.hpp at master · caoculus/cppcoro

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///////////////////////////////////////////////////////////////////////////////

// Copyright (c) Lewis Baker

// Licenced under MIT license. See LICENSE.txt for details.

///////////////////////////////////////////////////////////////////////////////

#ifndef CPPCORO_SEQUENCE_TRAITS_HPP_INCLUDED

#define CPPCORO_SEQUENCE_TRAITS_HPP_INCLUDED

#include <type_traits>

namespace cppcoro

{

template<typename SEQUENCE>

struct sequence_traits

{

using value_type = SEQUENCE;

using difference_type = std::make_signed_t<SEQUENCE>;

using size_type = std::make_unsigned_t<SEQUENCE>;

static constexpr value_type initial_sequence = static_cast<value_type>(-1);

static constexpr difference_type difference(value_type a, value_type b)

{

return static_cast<difference_type>(a - b);

}

static constexpr bool precedes(value_type a, value_type b)

{

return difference(a, b) < 0;

}

};

}

#endif